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8f2d3ea0 MK |
1 | /* Native-dependent code for Motorola 68000 BSD's. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2004-2020 Free Software Foundation, Inc. |
8f2d3ea0 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
8f2d3ea0 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
8f2d3ea0 | 19 | |
f90280ca KR |
20 | /* We define this to get types like register_t. */ |
21 | #define _KERNTYPES | |
8f2d3ea0 | 22 | #include "defs.h" |
cb162ff6 | 23 | #include "gdbcore.h" |
8f2d3ea0 MK |
24 | #include "inferior.h" |
25 | #include "regcache.h" | |
26 | ||
8f2d3ea0 MK |
27 | #include <sys/types.h> |
28 | #include <sys/ptrace.h> | |
29 | #include <machine/reg.h> | |
30 | ||
31 | #include "m68k-tdep.h" | |
bcfca652 | 32 | #include "inf-ptrace.h" |
8f2d3ea0 | 33 | |
f6ac5f3d PA |
34 | struct m68k_bsd_nat_target final : public inf_ptrace_target |
35 | { | |
36 | void fetch_registers (struct regcache *, int) override; | |
37 | void store_registers (struct regcache *, int) override; | |
38 | }; | |
39 | ||
40 | static m68k_bsd_nat_target the_m68k_bsd_nat_target; | |
41 | ||
8f2d3ea0 MK |
42 | static int |
43 | m68kbsd_gregset_supplies_p (int regnum) | |
44 | { | |
45 | return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); | |
46 | } | |
47 | ||
48 | static int | |
49 | m68kbsd_fpregset_supplies_p (int regnum) | |
50 | { | |
51 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); | |
52 | } | |
53 | ||
54 | /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ | |
55 | ||
56 | static void | |
57 | m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) | |
58 | { | |
59 | const char *regs = gregs; | |
60 | int regnum; | |
61 | ||
62 | for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) | |
73e1c03f | 63 | regcache->raw_supply (regnum, regs + regnum * 4); |
8f2d3ea0 MK |
64 | } |
65 | ||
66 | /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ | |
67 | ||
68 | static void | |
69 | m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) | |
70 | { | |
ac7936df | 71 | struct gdbarch *gdbarch = regcache->arch (); |
8f2d3ea0 MK |
72 | const char *regs = fpregs; |
73 | int regnum; | |
74 | ||
75 | for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) | |
73e1c03f SM |
76 | regcache->raw_supply (regnum, |
77 | regs + m68kbsd_fpreg_offset (gdbarch, regnum)); | |
8f2d3ea0 MK |
78 | } |
79 | ||
80 | /* Collect the general-purpose registers from REGCACHE and store them | |
81 | in GREGS. */ | |
82 | ||
83 | static void | |
84 | m68kbsd_collect_gregset (const struct regcache *regcache, | |
85 | void *gregs, int regnum) | |
86 | { | |
87 | char *regs = gregs; | |
88 | int i; | |
89 | ||
90 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
91 | { | |
92 | if (regnum == -1 || regnum == i) | |
34a79281 | 93 | regcache->raw_collect (i, regs + i * 4); |
8f2d3ea0 MK |
94 | } |
95 | } | |
96 | ||
97 | /* Collect the floating-point registers from REGCACHE and store them | |
98 | in FPREGS. */ | |
99 | ||
100 | static void | |
101 | m68kbsd_collect_fpregset (struct regcache *regcache, | |
102 | void *fpregs, int regnum) | |
103 | { | |
ac7936df | 104 | struct gdbarch *gdbarch = regcache->arch (); |
8f2d3ea0 MK |
105 | char *regs = fpregs; |
106 | int i; | |
107 | ||
108 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
109 | { | |
110 | if (regnum == -1 || regnum == i) | |
34a79281 | 111 | regcache->raw_collect (i, regs + m68kbsd_fpreg_offset (gdbarch, i)); |
8f2d3ea0 MK |
112 | } |
113 | } | |
114 | \f | |
115 | ||
116 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
117 | for all registers (including the floating-point registers). */ | |
118 | ||
f6ac5f3d PA |
119 | void |
120 | m68k_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) | |
8f2d3ea0 | 121 | { |
e99b03dc | 122 | pid_t pid = regcache->ptid ().pid (); |
bcc0c096 | 123 | |
8f2d3ea0 MK |
124 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
125 | { | |
126 | struct reg regs; | |
127 | ||
bcc0c096 | 128 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 129 | perror_with_name (_("Couldn't get registers")); |
8f2d3ea0 | 130 | |
56be3814 | 131 | m68kbsd_supply_gregset (regcache, ®s); |
8f2d3ea0 MK |
132 | } |
133 | ||
134 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
135 | { | |
136 | struct fpreg fpregs; | |
137 | ||
bcc0c096 | 138 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 139 | perror_with_name (_("Couldn't get floating point status")); |
8f2d3ea0 | 140 | |
56be3814 | 141 | m68kbsd_supply_fpregset (regcache, &fpregs); |
8f2d3ea0 MK |
142 | } |
143 | } | |
144 | ||
145 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
146 | this for all registers (including the floating-point registers). */ | |
147 | ||
f6ac5f3d PA |
148 | void |
149 | m68k_bsd_nat_target::store_registers (struct regcache *regcache, int regnum) | |
8f2d3ea0 | 150 | { |
e99b03dc | 151 | pid_t pid = regcache->ptid ().pid (); |
bcc0c096 | 152 | |
8f2d3ea0 MK |
153 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
154 | { | |
155 | struct reg regs; | |
156 | ||
bcc0c096 | 157 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 158 | perror_with_name (_("Couldn't get registers")); |
8f2d3ea0 | 159 | |
56be3814 | 160 | m68kbsd_collect_gregset (regcache, ®s, regnum); |
8f2d3ea0 | 161 | |
bcc0c096 | 162 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 163 | perror_with_name (_("Couldn't write registers")); |
8f2d3ea0 MK |
164 | } |
165 | ||
166 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
167 | { | |
168 | struct fpreg fpregs; | |
169 | ||
bcc0c096 | 170 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 171 | perror_with_name (_("Couldn't get floating point status")); |
8f2d3ea0 | 172 | |
56be3814 | 173 | m68kbsd_collect_fpregset (regcache, &fpregs, regnum); |
8f2d3ea0 | 174 | |
bcc0c096 | 175 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 176 | perror_with_name (_("Couldn't write floating point status")); |
8f2d3ea0 MK |
177 | } |
178 | } | |
cb162ff6 MK |
179 | \f |
180 | ||
181 | /* Support for debugging kernel virtual memory images. */ | |
182 | ||
cb162ff6 MK |
183 | #include <machine/pcb.h> |
184 | ||
185 | #include "bsd-kvm.h" | |
186 | ||
187 | /* OpenBSD doesn't have these. */ | |
188 | #ifndef PCB_REGS_FP | |
189 | #define PCB_REGS_FP 10 | |
190 | #endif | |
191 | #ifndef PCB_REGS_SP | |
192 | #define PCB_REGS_SP 11 | |
193 | #endif | |
194 | ||
195 | static int | |
196 | m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
197 | { | |
198 | int regnum, tmp; | |
199 | int i = 0; | |
200 | ||
201 | /* The following is true for NetBSD 1.6.2: | |
202 | ||
203 | The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for | |
204 | all callee-saved registers. From this information we reconstruct | |
205 | the register state as it would look when we just returned from | |
206 | cpu_switch(). */ | |
207 | ||
208 | /* The stack pointer shouldn't be zero. */ | |
209 | if (pcb->pcb_regs[PCB_REGS_SP] == 0) | |
210 | return 0; | |
211 | ||
212 | for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) | |
73e1c03f | 213 | regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); |
cb162ff6 | 214 | for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) |
73e1c03f | 215 | regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); |
cb162ff6 MK |
216 | |
217 | tmp = pcb->pcb_ps & 0xffff; | |
73e1c03f | 218 | regcache->raw_supply (M68K_PS_REGNUM, &tmp); |
cb162ff6 MK |
219 | |
220 | read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp); | |
73e1c03f | 221 | regcache->raw_supply (M68K_PC_REGNUM, &tmp); |
cb162ff6 MK |
222 | |
223 | return 1; | |
224 | } | |
cb162ff6 | 225 | |
6c265988 | 226 | void _initialize_m68kbsd_nat (); |
cb162ff6 | 227 | void |
6c265988 | 228 | _initialize_m68kbsd_nat () |
cb162ff6 | 229 | { |
d9f719f1 | 230 | add_inf_child_target (&the_m68k_bsd_nat_target); |
abbc6945 | 231 | |
cb162ff6 MK |
232 | /* Support debugging kernel virtual memory images. */ |
233 | bsd_kvm_add_target (m68kbsd_supply_pcb); | |
234 | } |